Magnocellular visual function and children's single word reading.

abstract：:Two moving random-pixel arrays (RPAs) were presented simultaneously in the same target field. These RPAs are perceived as two superimposed transparent moving sheets. Although two directions are perceived simultaneously during stimulus presentation, the movement aftereffect (MAE) is unidirectional. The visual system av...

journal_title：Vision research

authors： Verstraten FA,Fredericksen RE,van de Grind WA

更新日期：1994-02-01 00:00:00

abstract：:We measured thresholds for detecting the direction of curvature in slightly bent stimuli such as arcs and sinusoidal lines, and the direction of bend in chevrons and trapezoids in an initial experiment. Stimulus length varied over a wide range from 8.3 to 267 min arc. For sufficiently long stimuli, the angle between t...

journal_title：Vision research

authors： Kramer D,Fahle M

更新日期：1996-05-01 00:00:00

abstract：:We propose and test the simple hypothesis that a chicken eye can emmetropize without cues derived from accommodation or colour just by maximizing retinal image contrast. Using different translucent occluders with known modulation transfer functions we found that deprivation myopia is correlated with the amount of imag...

journal_title：Vision research

authors： Bartmann M,Schaeffel F

更新日期：1994-04-01 00:00:00

abstract：:Patients with central vision loss are often advised by low vision rehabilitation professionals to read bolder print to ameliorate their reading difficulties. Is boldface print really effective in improving reading performance for people with central vision loss? In this study, we evaluated how reading speed depends on...

journal_title：Vision research

authors： Chung STL,Bernard JB

更新日期：2018-12-01 00:00:00

abstract：:The perceived duration of a visual event is highly related to stimulus attributes. It is well known that a moving stimulus appears to last longer than a static one does. Previous studies have demonstrated that the time dilation in a moving stimulus can be influenced by perceived motion, rather than by mere physical mo...

journal_title：Vision research

authors： Hayashi D,Iwasawa H,Osugi T,Murakami I

更新日期：2019-03-01 00:00:00

abstract：:Two distinct paradigms have characterized most previous studies of texture perception: one has dealt with texture segregation, the other with the processing of texture gradients. Typically, studies of texture segregation have used stimuli with abrupt textural variations, whereas studies of texture gradient processing ...

journal_title：Vision research

authors： Kingdom FA,Keeble DR

更新日期：1996-02-01 00:00:00

abstract：:The electroretinogram (ERG) vs perfusion pressure relation was studied in anesthetized rabbits during mechanically induced changes in mean arterial pressure (MAP). After 1 hr of dark adaptation, ERGs were obtained at perfusion pressures from 10 to 95 mmHg with each pressure held for 30-60 sec, and at three levels from...

journal_title：Vision research

authors： Harrison JM,Kiel JW,Smith S

更新日期：1997-09-01 00:00:00

abstract：:The nominally steady-state accommodation response exhibits temporal variations which can be characterized by two dominant regions of activity; a low frequency component (LFC < 0.6 Hz) and a high frequency component (1.0 < or = HFC < or = 2.1 Hz). There is no consensus as to the relative contribution made by each of th...

journal_title：Vision research

authors： Gray LS,Winn B,Gilmartin B

更新日期：1993-10-01 00:00:00

abstract：:The purpose of this study was to investigate the nonlinear mechanism underlying brightness enhancement, in which a flickering stimulus appears brighter than a steady stimulus of equal mean luminance. The flickering and matching stimuli were temporally alternated. Both were cosine windowed to minimize the potential eff...

journal_title：Vision research

authors： Wu S,Burns SA,Reeves A,Elsner AE

更新日期：1996-06-01 00:00:00

abstract：:We use a difficult shape identification task to analyze how humans extract 3D surface structure from dynamic 2D stimuli--the kinetic depth effect (KDE). Stimuli composed of luminous tokens moving on a less luminous background yield accurate 3D shape identification regardless of the particular token used (either dots, ...

journal_title：Vision research

authors： Landy MS,Dosher BA,Sperling G,Perkins ME

更新日期：1991-01-01 00:00:00

abstract：:Neurons in the vertebrate retina are interconnected by a complex network of chemical and electrical synapses which make it difficult to study the intrinsic biochemical and biophysical properties of individual cells. During the past decade, enzymatic methods have been developed for dissociating adult retinas into viabl...

journal_title：Vision research

authors： Lam DM,Ayoub GS

更新日期：1983-01-01 00:00:00

abstract：:Previous psychophysical studies have revealed that shape similarity can affect apparent motion correspondence. Such results however, do not specify the level of representation, at which shape similarity is defined. We sought to understand this question by using a 2 x 2 competitive apparent motion paradigm. We manipula...

journal_title：Vision research

authors： He ZJ,Nakayama K

更新日期：1994-08-01 00:00:00

abstract：:Contributions to the multifocal electroretinogram (ERG) from the inner retina (i.e. ganglion and amacrine cells) were identified by recording from monkeys before and after intravitreal injections of n-methyl DL aspartate (NMDLA) and/or tetrodotoxin (TTX). Components similar in waveform to those removed by the drugs we...

journal_title：Vision research

authors： Hood DC,Greenstein V,Frishman L,Holopigian K,Viswanathan S,Seiple W,Ahmed J,Robson JG

更新日期：1999-06-01 00:00:00

abstract：:We describe and analyze an appearance-based 3-D object recognition system that avoids some of the problems of previous appearance-based schemes. We describe various large-scale performance tests and report good performance for full-sphere/hemisphere recognition of up to 24 complex, curved objects, robustness against c...

journal_title：Vision research

authors： Nelson RC,Selinger A

更新日期：1998-08-01 00:00:00

abstract：:Models based on spatial-frequency channels and local features provide alternative explanations for suprathreshold pattern discrimination. We compared psychophysical discrimination data with the predictions of the Wilson and Gelb channel model and three local-feature models. The features were peak-valley local contrast...

journal_title：Vision research

authors： Akutsu H,Legge GE

更新日期：1995-10-01 00:00:00

abstract：:We investigated temporal summation of the rods in a complete achromat, who lacks cone vision. Critical duration (tc) was estimated both at the achromat's preferred area of fixation and at an area 12 deg laterally in the nasal visual field. Comparable tc determinations were made in a normal trichromat. At background lu...

journal_title：Vision research

authors： Sharpe LT,Fach C,Nordby K

更新日期：1988-01-01 00:00:00

abstract：:It is well known that object recognition requires spatial frequencies exceeding some critical cutoff value. People with central scotomas who rely on peripheral vision have substantial difficulty with reading and face recognition. Deficiencies of pattern recognition in peripheral vision, might result in higher cutoff r...

journal_title：Vision research

authors： Kwon M,Legge GE

更新日期：2011-09-15 00:00:00

abstract：:Jumping spiders (Salticidae) are renowned for their high performing visual system. In addition to their prominent forward-facing telescope-like principal eyes, salticids possess two or three pairs of secondary eyes used for wide-angle motion detection. Salticids orient towards relevant sources of motion detected by th...

journal_title：Vision research

authors： Zurek DB,Nelson XJ

更新日期：2012-08-01 00:00:00

abstract：:By inducing feature-contingent depth aftereffects, we show that the human visual system combines feature information with depth information. These contingent aftereffects were revealed through the use of a novel selective adaptation paradigm whose stimuli required the combination of feature and depth information in or...

journal_title：Vision research

authors： Blaser E,Domini F

更新日期：2002-02-01 00:00:00

abstract：:What are the visual causes, rather than mere correlates, of attentional selection and how do they compare to each other during natural vision? To address these questions, we first strung together semantically unrelated dynamic scenes into MTV-style video clips, and performed eye tracking experiments with human observe...

journal_title：Vision research

authors： Carmi R,Itti L

更新日期：2006-12-01 00:00:00

abstract：:Dynamic random dot fusion, stereopsis and stereoacuity were evaluated in 149 healthy, fullterm infants, using both forced-choice preferential looking (FPL) and steady-state visual evoked potential (VEP) protocols. Few infants aged 2-3 months demonstrated fusion or stereopsis in either the FPL or VEP protocol; most inf...

journal_title：Vision research

authors： Birch E,Petrig B

更新日期：1996-05-01 00:00:00

abstract：:When an observer moves through the world, the motions of images on the retina provide information about the direction of observer motion, or "heading", and about the relative distance to surfaces in the scene. While it is simple to compute these quantities when the observer moves in a straight line, the computation be...

journal_title：Vision research

authors： Royden CS,Picone LJ

更新日期：2007-11-01 00:00:00

abstract：:Quantitative light microscopic techniques have been applied to photoreceptors, ganglion cells and dopaminergic amacrine cells in the retina of the North American opossum Didelphis virginiana. This marsupial has a retina with a central areal specialization where ganglion cells reach a maximum density of 2900/mm2 and co...

journal_title：Vision research

authors： Kolb H,Wang HH

更新日期：1985-01-01 00:00:00

abstract：:Six observers were asked to indicate in which of two opposite directions, to the right or to the left, an entire display appeared to move, based on the proportion of right vs leftward motion elements, each of which was distinctly visible. The performance of each observer was described by Thurstone's discriminative pro...

journal_title：Vision research

authors： Raidvee A,Averin K,Kreegipuu K,Allik J

更新日期：2011-09-01 00:00:00

abstract：:If the spatial-frequency of sinusoidal signals in a contrast-detection experiment varies randomly from trial to trial, then performance is decreased compared with that in a situation where it remains constant. This spatial-frequency uncertainty effect can more or less be compensated by presenting informative cues shor...

journal_title：Vision research

authors： Hübner R

更新日期：1996-11-01 00:00:00

abstract：:A new discrete-time reverse-correlation scheme for the study of visual neurons is proposed. The visual stimulus is generated by drawing with uniform probability, at each refresh time, an image from a finite set S of orthonormal images. We show that if the neuron can be modeled as a spatiotemporal linear filter followe...

journal_title：Vision research

authors： Ringach DL,Sapiro G,Shapley R

更新日期：1997-09-01 00:00:00

abstract：:The number and nature of spatial channels tuned to low spatial frequencies in photopic vision was examined by measuring individual differences in the contrast sensitivity functions (CSFs) of seven visually normal adults. Stationary, 51 cd/m2, low spatial frequency sinusoidal gratings between 0.27 and 2.16 c/deg were u...

journal_title：Vision research

authors： Peterzell DH,Teller DY

更新日期：1996-10-01 00:00:00

abstract：:We examine whether the rules of cyclopean visual direction, as expressed by Hering and others, correctly predict the percept of visual direction for structured visual stimuli. Theoretical inspection of the rules of cyclopean visual direction shows a paradox for the binocular visual directions of stimuli in which objec...

journal_title：Vision research

authors： Erkelens CJ,van de Grind WA

更新日期：1994-11-01 00:00:00

abstract：:A static or counterphase (target) grating surrounded by drifting (inducer) gratings is perceived to move in the direction opposite that of the inducers. We compared the relative magnitudes of these simultaneous motion contrasts generated by both first-order and second-order stimuli. The first-order stimuli were sinuso...

journal_title：Vision research

authors： Nishida S,Edwards M,Sato T

更新日期：1997-01-01 00:00:00

abstract：:Sand deserts are common biotopes on the earth's surface. Some specialized vertebrate species have colonized these ecological habitats by living buried in the sand. Among these so called psammophilic species are the Scincidae sand dune living species Scincus scincus and Eumeces schneideri. These two skinks share a rela...

journal_title：Vision research

authors： Canei J,Burtea C,Nonclercq D

更新日期：2020-04-28 00:00:00